For the sauce, mix the sour cream, mayonnaise, capers, pickles, dill, onion, pickle juice, lemon juice, salt, and pepper in a small bowl and let it rest briefly.
Bake the fish sticks in an air fryer at 200°C (390°F) for 10 minutes until crispy.
Top the fish sticks with cheddar cheese slices and air fry for 1 more minute until the cheese is melted.
Prepare the french fries in the air fryer according to package instructions.
Toast the brioche buns in a pan with a little butter until golden brown.
Spread the prepared sauce on the toasted buns, place the cheese-topped fish sticks inside, and assemble the burgers. Serve with the crispy fries.
Cook it hands-free.
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